Jay was asked to create a quadratic equation in one variable with a = -1, b = -2, c= 1. The equation he made was -22 – 20 = 1. Is he correct? If not, find the correct equation. (1 point)
Yes, he is correct.
O No, the correct equation is 22 - 2x + 1 = 0.
O No, the correct equation is r? - 2r + 1 = 0.
O No, the correct equation is -27 - 21 = 0.
Check Answer

rotated. i took the test

step-by-step explanation:

step-by-step explanation:

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(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240